svn commit: r266778 - head/sys/powerpc/powerpc

[Nathan Whitehorn]

Author: nwhitehorn
Date: Tue May 27 23:57:22 2014
New Revision: 266778
URL: http://svnweb.freebsd.org/changeset/base/266778

Log:
  Repair nested signal handling on PowerPC. The signal trampoline code
  was not allocating space for the parameter save area in the stack frame.
  If the compiler chose to save the argument to the signal handler on the
  stack, it would overwrite the first 32 bits of the sigaction struct with
  it, corrupting it for a subsequent invocation.
  
  PR:		powerpc/183040
  MFC after:	8 days

Modified:
  head/sys/powerpc/powerpc/sigcode32.S
  head/sys/powerpc/powerpc/sigcode64.S

Modified: head/sys/powerpc/powerpc/sigcode32.S
==============================================================================
--- head/sys/powerpc/powerpc/sigcode32.S	Tue May 27 23:39:28 2014	(r266777)
+++ head/sys/powerpc/powerpc/sigcode32.S	Tue May 27 23:57:22 2014	(r266778)
@@ -45,9 +45,9 @@
  */
 	.globl	CNAME(sigcode32),CNAME(szsigcode32)
 CNAME(sigcode32):
-	addi	1,1,-16			/* reserved space for callee */
+	addi	1,1,-20			/* reserved space for callee */
 	blrl
-	addi	3,1,16+SF_UC		/* restore sp, and get &frame->sf_uc */
+	addi	3,1,20+SF_UC		/* restore sp, and get &frame->sf_uc */
 	li	0,SYS_sigreturn
 	sc				/* sigreturn(scp) */
 	li	0,SYS_exit

Modified: head/sys/powerpc/powerpc/sigcode64.S
==============================================================================
--- head/sys/powerpc/powerpc/sigcode64.S	Tue May 27 23:39:28 2014	(r266777)
+++ head/sys/powerpc/powerpc/sigcode64.S	Tue May 27 23:57:22 2014	(r266778)
@@ -45,7 +45,7 @@
  */
 	.globl	CNAME(sigcode64),CNAME(szsigcode64)
 CNAME(sigcode64):
-	addi	1,1,-48			/* reserved space for callee */
+	addi	1,1,-112		/* reserved space for callee */
 	mflr	2			/* resolve function descriptor */
 	ld	0,0(2)			
 	ld	2,8(2)
@@ -53,7 +53,7 @@ CNAME(sigcode64):
 
 	blrl
 
-	addi	3,1,48+SF_UC		/* restore sp, and get &frame->sf_uc */
+	addi	3,1,112+SF_UC		/* restore sp, and get &frame->sf_uc */
 	li	0,SYS_sigreturn
 	sc				/* sigreturn(scp) */
 	li	0,SYS_exit